Abstract
Tofu production is a domestic industry, that most of it has no appropriate wastewater treatment facilities. Wastewater of tofu contains high organic matter which can decrease the water quality. This study aimed to analyze capability of Vetiveria zizanioides, L and zeliac in treating tofu wastewater industry. Zeliac is a new adsorbent, which consists of zeolite, activated carbon, limestone, rice husk ash and cement. Response surface methodology was applied to analyze the data, using central composite design with two factors, i.e., time (3, 9, and 15 days) and waste concentration (20, 40, and 60%). The optimum treatment occurred at the time of 15 days and 38.41% of tofu wastewater concentration decreasing up to 76% of COD, 71.78% of BOD, and 75.28% of TSS.
Highlights
Industrial activity of tofu in Indonesia is mostly domestic industries; most industries do not have a waste treatment facility
The results show that the addition of zeliac had a higher performance in removing Cr(VI)
Initial characteristics of tofu wastewater prior to treatment were chemical oxygen demand (COD) (5759 mg/L), biological oxygen demand (BOD) (580 mg/L), total suspended solid (TSS) (552 mg/L), and pH (3.9). This value was above the quality standard of the Government Regulation No 05 of 2014 on Quality Standard of Industrial tofu wastewater namely BOD (150 mg/L), COD (300 mg/L), TSS (200 mg/L) and pH (6–9)
Summary
Industrial activity of tofu in Indonesia is mostly domestic industries; most industries do not have a waste treatment facility. Tofu wastewater contains organic substances that can cause the rapid growth of microbes in the water. The COD and BOD of wastewater from tofu processing facilities in Banda Aceh were ranging from 5000 to 8500 and from 3500 to 4500 mg/L, respectively. Those high concentrations of organic compounds can cause bad odours, pollution of the surface, ground water, and river (Faisal et al 2015). This can lead to decrease in oxygen levels. The application of the method is relatively difficult.
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